The following research work will be carried out taking into account a population of 200 children (200 x-rays) who attend the Diagnostic Imaging Service of the Faculty of Dentistry of the National University of La Plata. Objectives: The state of the first permanent molar will be determined in children from 6 to 9 years of age in children attending the Diagnostic Imaging Service of the School of Dentistry of the UNLP.